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Plumberpro, Home Appliance Technician
Category: Appliance
Satisfied Customers: 634
Experience:  Heating and hot water heating appliances experienced
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I have a ST699 Programmer. About 17 years old After a power

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I have a ST699 Programmer. About 17 years old
After a power cut to day, when power was restored, the screen on my programmer produced a picture that I have never seen before.
At the top of the screen are 7 equally spaced dots. Below is the figure 88:88, although the first 8 is not complete in it's structure.
The boiler is lit (yellow/orange) but the reset button has no effect.
Plumberpro :

Hi , there is a back up battery in the unit . take the programmer off the back plate , access the battery and replace . if the programmer is still not working it will be a board failure and replace .

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